drivers/gpu/drm/msm/msm_atomic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include <drm/drm_atomic_uapi.h>
   8 #include <drm/drm_gem_atomic_helper.h>
   9 #include <drm/drm_vblank.h>
  10
  11 #include "msm_atomic_trace.h"
  12 #include "msm_drv.h"
  13 #include "msm_gem.h"
  14 #include "msm_kms.h"
  15
  16 int msm_atomic_prepare_fb(struct drm_plane *plane,
  17                           struct drm_plane_state *new_state)
  18 {
  19         struct msm_drm_private *priv = plane->dev->dev_private;
  20         struct msm_kms *kms = priv->kms;
  21
  22         if (!new_state->fb)
  23                 return 0;
  24
  25         drm_gem_plane_helper_prepare_fb(plane, new_state);
  26
  27         return msm_framebuffer_prepare(new_state->fb, kms->aspace);
  28 }
  29
  30 /*
  31  * Helpers to control vblanks while we flush.. basically just to ensure
  32  * that vblank accounting is switched on, so we get valid seqn/timestamp
  33  * on pageflip events (if requested)
  34  */
  35
  36 static void vblank_get(struct msm_kms *kms, unsigned crtc_mask)
  37 {
  38         struct drm_crtc *crtc;
  39
  40         for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
  41                 if (!crtc->state->active)
  42                         continue;
  43                 drm_crtc_vblank_get(crtc);
  44         }
  45 }
  46
  47 static void vblank_put(struct msm_kms *kms, unsigned crtc_mask)
  48 {
  49         struct drm_crtc *crtc;
  50
  51         for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
  52                 if (!crtc->state->active)
  53                         continue;
  54                 drm_crtc_vblank_put(crtc);
  55         }
  56 }
  57
  58 static void lock_crtcs(struct msm_kms *kms, unsigned int crtc_mask)
  59 {
  60         int crtc_index;
  61         struct drm_crtc *crtc;
  62
  63         for_each_crtc_mask(kms->dev, crtc, crtc_mask) {
  64                 crtc_index = drm_crtc_index(crtc);
  65                 mutex_lock_nested(&kms->commit_lock[crtc_index], crtc_index);
  66         }
  67 }
  68
  69 static void unlock_crtcs(struct msm_kms *kms, unsigned int crtc_mask)
  70 {
  71         struct drm_crtc *crtc;
  72
  73         for_each_crtc_mask_reverse(kms->dev, crtc, crtc_mask)
  74                 mutex_unlock(&kms->commit_lock[drm_crtc_index(crtc)]);
  75 }
  76
  77 static void msm_atomic_async_commit(struct msm_kms *kms, int crtc_idx)
  78 {
  79         unsigned crtc_mask = BIT(crtc_idx);
  80
  81         trace_msm_atomic_async_commit_start(crtc_mask);
  82
  83         lock_crtcs(kms, crtc_mask);
  84
  85         if (!(kms->pending_crtc_mask & crtc_mask)) {
  86                 unlock_crtcs(kms, crtc_mask);
  87                 goto out;
  88         }
  89
  90         kms->pending_crtc_mask &= ~crtc_mask;
  91
  92         kms->funcs->enable_commit(kms);
  93
  94         vblank_get(kms, crtc_mask);
  95
  96         /*
  97          * Flush hardware updates:
  98          */
  99         trace_msm_atomic_flush_commit(crtc_mask);
 100         kms->funcs->flush_commit(kms, crtc_mask);
 101
 102         /*
 103          * Wait for flush to complete:
 104          */
 105         trace_msm_atomic_wait_flush_start(crtc_mask);
 106         kms->funcs->wait_flush(kms, crtc_mask);
 107         trace_msm_atomic_wait_flush_finish(crtc_mask);
 108
 109         vblank_put(kms, crtc_mask);
 110
 111         kms->funcs->complete_commit(kms, crtc_mask);
 112         unlock_crtcs(kms, crtc_mask);
 113         kms->funcs->disable_commit(kms);
 114
 115 out:
 116         trace_msm_atomic_async_commit_finish(crtc_mask);
 117 }
 118
 119 static void msm_atomic_pending_work(struct kthread_work *work)
 120 {
 121         struct msm_pending_timer *timer = container_of(work,
 122                         struct msm_pending_timer, work.work);
 123
 124         msm_atomic_async_commit(timer->kms, timer->crtc_idx);
 125 }
 126
 127 int msm_atomic_init_pending_timer(struct msm_pending_timer *timer,
 128                 struct msm_kms *kms, int crtc_idx)
 129 {
 130         timer->kms = kms;
 131         timer->crtc_idx = crtc_idx;
 132
 133         timer->worker = kthread_create_worker(0, "atomic-worker-%d", crtc_idx);
 134         if (IS_ERR(timer->worker)) {
 135                 int ret = PTR_ERR(timer->worker);
 136                 timer->worker = NULL;
 137                 return ret;
 138         }
 139         sched_set_fifo(timer->worker->task);
 140
 141         msm_hrtimer_work_init(&timer->work, timer->worker,
 142                               msm_atomic_pending_work,
 143                               CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 144
 145         return 0;
 146 }
 147
 148 void msm_atomic_destroy_pending_timer(struct msm_pending_timer *timer)
 149 {
 150         if (timer->worker)
 151                 kthread_destroy_worker(timer->worker);
 152 }
 153
 154 static bool can_do_async(struct drm_atomic_state *state,
 155                 struct drm_crtc **async_crtc)
 156 {
 157         struct drm_connector_state *connector_state;
 158         struct drm_connector *connector;
 159         struct drm_crtc_state *crtc_state;
 160         struct drm_crtc *crtc;
 161         int i, num_crtcs = 0;
 162
 163         if (!(state->legacy_cursor_update || state->async_update))
 164                 return false;
 165
 166         /* any connector change, means slow path: */
 167         for_each_new_connector_in_state(state, connector, connector_state, i)
 168                 return false;
 169
 170         for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
 171                 if (drm_atomic_crtc_needs_modeset(crtc_state))
 172                         return false;
 173                 if (++num_crtcs > 1)
 174                         return false;
 175                 *async_crtc = crtc;
 176         }
 177
 178         return true;
 179 }
 180
 181 /* Get bitmask of crtcs that will need to be flushed.  The bitmask
 182  * can be used with for_each_crtc_mask() iterator, to iterate
 183  * effected crtcs without needing to preserve the atomic state.
 184  */
 185 static unsigned get_crtc_mask(struct drm_atomic_state *state)
 186 {
 187         struct drm_crtc_state *crtc_state;
 188         struct drm_crtc *crtc;
 189         unsigned i, mask = 0;
 190
 191         for_each_new_crtc_in_state(state, crtc, crtc_state, i)
 192                 mask |= drm_crtc_mask(crtc);
 193
 194         return mask;
 195 }
 196
 197 void msm_atomic_commit_tail(struct drm_atomic_state *state)
 198 {
 199         struct drm_device *dev = state->dev;
 200         struct msm_drm_private *priv = dev->dev_private;
 201         struct msm_kms *kms = priv->kms;
 202         struct drm_crtc *async_crtc = NULL;
 203         unsigned crtc_mask = get_crtc_mask(state);
 204         bool async = kms->funcs->vsync_time &&
 205                         can_do_async(state, &async_crtc);
 206
 207         trace_msm_atomic_commit_tail_start(async, crtc_mask);
 208
 209         kms->funcs->enable_commit(kms);
 210
 211         /*
 212          * Ensure any previous (potentially async) commit has
 213          * completed:
 214          */
 215         lock_crtcs(kms, crtc_mask);
 216         trace_msm_atomic_wait_flush_start(crtc_mask);
 217         kms->funcs->wait_flush(kms, crtc_mask);
 218         trace_msm_atomic_wait_flush_finish(crtc_mask);
 219
 220         /*
 221          * Now that there is no in-progress flush, prepare the
 222          * current update:
 223          */
 224         kms->funcs->prepare_commit(kms, state);
 225
 226         /*
 227          * Push atomic updates down to hardware:
 228          */
 229         drm_atomic_helper_commit_modeset_disables(dev, state);
 230         drm_atomic_helper_commit_planes(dev, state, 0);
 231         drm_atomic_helper_commit_modeset_enables(dev, state);
 232
 233         if (async) {
 234                 struct msm_pending_timer *timer =
 235                         &kms->pending_timers[drm_crtc_index(async_crtc)];
 236
 237                 /* async updates are limited to single-crtc updates: */
 238                 WARN_ON(crtc_mask != drm_crtc_mask(async_crtc));
 239
 240                 /*
 241                  * Start timer if we don't already have an update pending
 242                  * on this crtc:
 243                  */
 244                 if (!(kms->pending_crtc_mask & crtc_mask)) {
 245                         ktime_t vsync_time, wakeup_time;
 246
 247                         kms->pending_crtc_mask |= crtc_mask;
 248
 249                         vsync_time = kms->funcs->vsync_time(kms, async_crtc);
 250                         wakeup_time = ktime_sub(vsync_time, ms_to_ktime(1));
 251
 252                         msm_hrtimer_queue_work(&timer->work, wakeup_time,
 253                                         HRTIMER_MODE_ABS);
 254                 }
 255
 256                 kms->funcs->disable_commit(kms);
 257                 unlock_crtcs(kms, crtc_mask);
 258                 /*
 259                  * At this point, from drm core's perspective, we
 260                  * are done with the atomic update, so we can just
 261                  * go ahead and signal that it is done:
 262                  */
 263                 drm_atomic_helper_commit_hw_done(state);
 264                 drm_atomic_helper_cleanup_planes(dev, state);
 265
 266                 trace_msm_atomic_commit_tail_finish(async, crtc_mask);
 267
 268                 return;
 269         }
 270
 271         /*
 272          * If there is any async flush pending on updated crtcs, fold
 273          * them into the current flush.
 274          */
 275         kms->pending_crtc_mask &= ~crtc_mask;
 276
 277         vblank_get(kms, crtc_mask);
 278
 279         /*
 280          * Flush hardware updates:
 281          */
 282         trace_msm_atomic_flush_commit(crtc_mask);
 283         kms->funcs->flush_commit(kms, crtc_mask);
 284         unlock_crtcs(kms, crtc_mask);
 285         /*
 286          * Wait for flush to complete:
 287          */
 288         trace_msm_atomic_wait_flush_start(crtc_mask);
 289         kms->funcs->wait_flush(kms, crtc_mask);
 290         trace_msm_atomic_wait_flush_finish(crtc_mask);
 291
 292         vblank_put(kms, crtc_mask);
 293
 294         lock_crtcs(kms, crtc_mask);
 295         kms->funcs->complete_commit(kms, crtc_mask);
 296         unlock_crtcs(kms, crtc_mask);
 297         kms->funcs->disable_commit(kms);
 298
 299         drm_atomic_helper_commit_hw_done(state);
 300         drm_atomic_helper_cleanup_planes(dev, state);
 301
 302         trace_msm_atomic_commit_tail_finish(async, crtc_mask);
 303 }